This page shows the result of the GET request to the https://reqbin.com. The --insecure option is used to disable certificate verification, and the --anyauth option tells curl to decide the authentication method to use the most secure one the remote site claims it supports. The -v, or --verbose option makes the operation more talkative.
AnyAuth allows developers to easily authenticate using any third-party system that is not respective of security protocol, and integrate apps with a company’s corporate directory. Setting a specific authentication method with --basic, --digest, --ntlm, and --negotiate options is another way of authentication.